For the longest time, I was gaming on an SD tv (probably, like 14") with naught but an RF modulator for input. My gamecube sure looked like ass on that thing. Even made this incredibly annoying garbled and loud sound every now and then while playing Wind Waker (still not sure exactly what that was). Bought a 32" LCD a couple years ago for the Xbox 360 (not to mention normal TV watching), but now I've switched that onto my PC monitor, anyway, since the TV is always being used and I'd rather not deal with monopolizing the TV, myself. Any monitor these days is still way higher than HD resolution (720p), technically.
360 is hooked up to a 32 inch SD tv and my compupter monitor is a 23" 1080p monitor that looks oh so pretty. Slowly saving up for an hdtv for the 360 and soon PS3.
Yup that's pretty much what I have to do. Usually if I'm looking at a wall that doesn't quite look like a wall I shoot it because more often than not there is a dude there that I just cant see.